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Financial Instruments and Fair Value Measurements - Assets and Liabilities Associated with Interest Rate Derivatives (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
ASSETS    
Other current assets $ 0.0 $ 0.4
Other long-term assets 1.9 13.1
Total 1.9 13.5
Liabilities from interest rate risk management activities    
Accrued expenses and other current liabilities 2.8 0.1
Other liabilities 4.4 1.7
Total $ 7.2 $ 1.8